I recently discovered this place a few months back when I finally moved my son over to his own account. I was leveling a kitty druid, he was leveling a rogue, both classes neither of us had played before. We were questing in Hillsbrad and my son told me his rogue needed to go do some things and proceeded to the secret hideout. How he knew about it I don’t know, probably some secret rogue thing. But yes, I was quite surprised to find this large compound of secret rogue training that I had never heard of. And I’ve been playing since open beta of vanilla!